Professional MediaWiki Development

Collaborate with us on your next software project.
Enjoy a stress-free experience and a reliable product.

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Semantic MediaWiki logo

Semantic MediaWiki

MediaWiki Development Services

  • MediaWiki Extension Development Our MediaWiki developers create or enhance extensions for your specific needs.
  • MediaWiki Integration Our consultants integrate your MediaWiki with other software. Authentication, import, export, web hooks, APIs, we have got you covered.
  • MediaWiki Skinning Make your wiki look unique with a custom theme. Our developers create a new MediaWiki skin or configure an existing one such as our very own Chameleon.
  • MediaWiki Import Tooling Import data from other systems into MediaWiki. Our developers create import tooling, possibly based on Semantic MediaWiki or Wikibase.
  • MediaWiki API Development Make data stored in your wiki accessible by external systems. Our developers create high-performing and compliant web APIs for your wiki.

Your Benefits

High standards

Proven track record

Iterative processes

  • Play it safe We have a long and proven track record of successful projects starting in 2009. We are well respected within the MediaWiki community.
  • Work with real experts We have a unique combination of deep MediaWiki and deep software development expertise. You don't have to take our word for it, our track record and public code repositories speak for themselves.
  • Get your desired results quickly We practice iterative development and work with our clients to ensure we create the best solutions for their use cases.
  • Enjoy quality software We deliver sustainable software with high internal and external quality. We follow clean code practices, create automated tests and develop with continuous integration.
  • Bug-free, guaranteed Bugs are our responsibility. We are committed to delivering quality work. If any bugs do slip through, we fix them free of charge.

Our team has developed software for

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About Professional Wiki


years of experience


clients helped


extensions created


code changes

Professional Wiki GmbH is a Berlin-based company with an international team that serves international clients.

We are MediaWiki veterans with expertise that includes MediaWiki hosting and MediaWiki software development.

Professional Wiki has made significant contributions to MediaWiki, Semantic MediaWiki and Wikibase. We also created over 40 MediaWiki extensions and wrote a lot of the MediaWiki documentation.

We are a customer-focused agile company. We value professionalism, quality and sustainability. Learn more Join our team.

Learn more about Professional Wiki.

Get Started

Contact us with the details of your project.

Customer Testimonials

"Professional Wiki provided Rhizome with competent and timely custom development work. Making use of all the tools that are available to open source developers today, the team built extensions that follow modern software design guidelines, are easy to install, configure, and maintain, and include good documentation and automated testing. Quite unique in the Mediawiki space!"
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Dragan Espenschied / Preservation Director, Rhizome
"I had the pleasure to work with Jeroen at Wikimedia Deutschland. Jeroen is one of the most productive and passionate developers that I know. Without Jeroen, Wikidata would not have such a rich range of functions and would be built on a less flexible, lower-quality codebase and architecture. Jeroen has in-depth knowledge and broad experience about clean code and software architectures. I have always appreciated his professional attitude, collegial and reliable manner. He is an absolute win for any team and project!"
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Abraham Taherivand / Executive Director, Wikimedia Deutschland
"Jeroen is Technical Director at Professional Wiki. Jeroen was working on Semantic MediaWiki and was one of the original developers on Wikibase at Wikimedia Deutschland. I had the pleasure of working with Jeroen for many years and have rarely found someone as dedicated as him towards the quality of the software he is working on."
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Denny Vrandečić / Head of Special Projects, Wikimedia Foundation
"We were lucky to have had multiple opportunities to work with Professional Wiki and were consistently impressed by their expertise and commitment to quality. They deliver outstanding results and provide back to the open source community. Professional Wiki is professional, knowledgeable, and dedicated to delivering top-notch software. Their passion and experience in software architecture and clean code are evident in every project they take on. We highly recommend Professional Wiki for any project in the Mediawiki/Wikibase space."
IP Squared and Digital Werktuig on Automated Values and Wikibase EDTF

Recent MediaWiki Extensions

Public MediaWiki extensions that we recently created for our clients.

Wikibase Export
Created in 2022 for Universität Mannheim

Wikibase Export adds a user-friendly and customizable export interface to Wikibase.

Source code Documentation Demo wiki Demo video
Automated Values
Created in 2022 for the Luxembourg Ministry of Culture

Wikibase extension that allows defining rules to automatically set labels or aliases based on Statement values.

Source code Documentation Demo wiki Demo video
External Content
Created in 2022 for Pega Systems

Allows embedding and rendering markdown files into wiki pages. Has special integration with GitHub and Bitbucket.

Source code Documentation Demo video
Wikibase RDF
Created in 2022 for the Wikibase Stakeholder Group

Wikibase extension that allows defining RDF mappings for Wikibase Entities.

Source code Documentation Demo wiki
Wikibase EDTF
Created in 2021 for the Luxembourg Ministry of Culture

Wikibase Export adds a user-friendly and customizable export interface to Wikibase.

Source code Documentation Demo wiki Demo video Library source
Created in 2020 for KDZ

Extension for visualizing connections between pages via an interactive network graph.

Source code Documentation Demo video

Our MediaWiki Projects

We created over 40 MediaWiki extensions and contributed to over 100. Here are some highlights:

Professional Wiki - Semantic MediaWiki development

Semantic MediaWiki

Semantic MediaWiki (SMW) is a free, open-source extension to MediaWiki that lets you store and query data within the wiki's pages.

Work with the best Semantic MediaWiki developers in the world. We created large parts of SMW, are its maintainers, and also provide Semantic MediaWiki hosting.

Professional Wiki - Wikibase development


Wikibase is a free, open-source software platform for creating knowledge bases. It powers Wikidata and is primarily developed by Wikimedia Deutschland.

Work with the best Wikibase developers. We created large parts of Wikibase itself, developed various extensions for our clients, and provide Wikibase hosting.

Created in 2009 during Google Summer of Code

Google Maps and Leaflet integration for MediaWiki. Embed dynamic and highly customizable maps into your wiki. Features a visual map editor and integration with Semantic MediaWiki.

Source code Documentation Demo wiki Demo video
Created in 2014

We maintain Chameleon, the most popular responsive MediaWiki skin. Chameleon is highly customizable, often used by companies to brand their corporate wikis in line with their corporate identity.

Source code Documentation Examples wikis
Launched in 2022

We created the most modern MediaWiki hosting product on the market. Create your wiki by filling out a simple form and manage it via a user-friendly wiki administration interface.

We developed ProWiki with the same rigor that we apply to projects for our clients. While it is not open source, our creation and operation of the platform demonstrates our expertise.

Website Blog

Our History

  • ...


    Our Humble Beginnings

    Our founders attend their first SMWCon. Jeroen creates the Maps extension.

  • ...


    We Level Up

    We become maintainers of Semantic MediaWiki. Jeroen creates Wikibase and Wikidata, and is promoted to Software Architect at Wikimedia Deutschland. Karsten launches WikiHoster.

  • ...

    January 2019

    Founding of Professional Wiki

    We start collaborating formally to deliver next-level MediaWiki services.

  • ...

    May 2022

    ProWiki Launches

    We launch ProWiki, the most modern and user-friendly MediaWiki hosting platform.

Learn more about Professional Wiki.

Get Started

Contact us with the details of your project.


Yes, we do. It is up to our clients to decide whether the work we do for them is open-source and which license should be used. In the case of open-source projects, they decide to which degree the software should be made available to the community via documentation and demos.
We cannot transfer our multi-decade experience in the course of one day.

From Our Blogs

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Automated Values Released

We developed a new MediaWiki extension for the Luxembourg Ministry of Culture. Automate value creation in your Wikibase.

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Fast Bulk Import Into Wikibase

Importing a large number of Items into Wikibase can be a challenge. We provide a high-level overview of importing approaches and their performance.

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Advice for Junior Developers

Jeroen shares his advice for junior developers. This is a great read for anyone who is just starting out with programming.

Get Started

Contact us with the details of your project.

More MediaWiki Services

Wikibase software development

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Get superior results from the best MediaWiki developers with a proven tack record of creating MediaWiki extensions & integrations.

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Make your wiki look great! Use a time-tested responsive MediaWiki theme, or have us create a custom MediaWiki skin for you.

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Let us take care of your wiki. We are MediaWiki hosting experts and provide cloud hosting, on-premise hosting, and dedicated hosting.

Find the Perfect Wiki Hosting Plan
MediaWiki Consulting icon MediaWiki Consulting

Bring your wiki to the next level by leveraging our MediaWiki expertise. From strategic planning to wikitext, we have you covered.

Explore Our Consulting Services
MediaWiki Migration icon MediaWiki Migration

Migrate your wiki with confidence. We move your MediaWiki to a new home, or we help you migrate from another system to MediaWiki.

Migrate Your Wiki
MediaWiki Upgrades icon MediaWiki Upgrades

Keep your MediaWiki up-to-date and secure. We offer MediaWiki maintenance services to keep your wiki running smoothly.

Secure & Update Your Wiki